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How to Repair a Cracked Composite Door Although composite doors are incredibly robust, they can still be susceptible to cracks that are caused by general wear and tear. These cracks are typically simple to repair. All you need to do is apply the plastic filler and UPC-friendly cleaning agent (HG uPVC powerful cleaner is the best choice). You will also require medium or fine grit Sandpaper. First, you must clean the crack. Identifying the Crack Composite doors are a common choice for front doors due to t